/Engine/Plugins/Runtime/Metasound/Source/MetasoundGraphCore/Public/MetasoundDataReference.h
If the vertex is bound with this will return a valid pointer. Otherwise it will return a nullptr. This method will assert if the reference is bound, but not writable or if the data type does match.
template<typename [DataType](API\Plugins\OptimusCore\DataType)> [DataType](API\Plugins\OptimusCore\DataType) * GetWritableValue() const